XML 81 R70.htm IDEA: XBRL DOCUMENT
v3.20.2

Financing Agreements (Financing Agreements, at Fair Values Narrative) (Details) - USD ($) $ in Thousands |  | 6 Months Ended |
--- | --- | --- | ---
Jun. 26, 2020 | Jun. 30, 2020 | Dec. 31, 2019
Financing Agreements [Line Items] |  |  |
Agreement amount |  | $ 5,047,981 | $ 10,044,844
Financial instruments |  | 5,011,356 | $ 10,031,606
Senior secured credit agreement |  |  |
Financing Agreements [Line Items] |  |  |
Agreement amount |  | 500,000 |
Financial instruments |  | 480,959 |
Agreements with mark-to-market collateral provisions |  |  |
Financing Agreements [Line Items] |  |  |
Agreement amount |  | 1,656,248 |
Financial instruments | $ 1,650,000 | 1,656,248 |
Agreements with non-mark-to-market collateral provisions |  |  |
Financing Agreements [Line Items] |  |  |
Agreement amount |  | 2,036,597 |
Financial instruments |  | 2,036,597 |
Non Mark to Market Financing Facilities |  |  |
Financing Agreements [Line Items] |  |  |
Financial instruments |  | 1,600,000 |
Debt instrument term | 2 years |  |
Non Mark to Market Financing Facilities on Rehabilitation Loans |  |  |
Financing Agreements [Line Items] |  |  |
Debt outstanding |  | $ 474,600 |
Minimum | Agreements with mark-to-market collateral provisions |  |  |
Financing Agreements [Line Items] |  |  |
Debt instrument term |  | 1 month |
Maximum | Agreements with mark-to-market collateral provisions |  |  |
Financing Agreements [Line Items] |  |  |
Debt instrument term |  | 3 months |

X
- Definition Financing Agreements, Fair Value and Carrying Value + References No definition available. + Details
Name: | mfa_FinancingAgreementsFairValueandCarryingValue
Namespace Prefix: | mfa_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition [Line Items] for Financing Agreements [Table] + References No definition available. + Details
Name: | mfa_FinancingAgreementsLineItems
Namespace Prefix: | mfa_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Financing Agreements, Unpaid Principal Balance + References No definition available. + Details
Name: | mfa_FinancingAgreementsUnpaidPrincipalBalance
Namespace Prefix: | mfa_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=120520924&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 + Details
Name: | us-gaap_DebtInstrumentCarryingAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentTerm
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=mfa_SeniorSecuredCreditAgreementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=mfa_AgreementsWithMarkToMarketCollateralProvisionsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=mfa_AgreementsWithNonMarkToMarketCollateralProvisionsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=mfa_NonMarktoMarketFinancingFacilitiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=mfa_NonMarktoMarketFinancingFacilitiesonRehabilitationLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |